The one major difference between Sinn and Pfaelzer’s was their opinion and thoughts about Chinese immigrants;
Chinese immigrants played a significant role in the construction of the railroads in the American West, and as their laborers prospered there, many of them went on to found their own businesses.
However, economic hardship brought on by Britain's rising domination over China following its victory over China in the Opium War of 1839–1842 was the primary driver of Chinese immigration.
These three factors account for the immigration of Chinese individuals to the US.
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